Sorry if I have messed the text up on here. I may have cut and past the info in two parts of your online form.
2003 Chev Avalanche 1500 - Northface - ABS Alarms on Bumps. Doors lock and unlock
Hi there, you guys have been able to help out in the past so let’s try again (Vehicle: 2003 Chev Avalanche 1500 Northface 5.3L Automatic Custom tune flashed at speed shop with header install.
Current problem, about a month ago had an issue where hit a bump (pot hole) and received an ABS alarm and door locks locked and unlocked. Pulled over, shut down, started and went away. Checked with the Diablo Predator for DTC codes – none – use the Diablo for codes only as the custom tune has been flashed.
We had been through about a week of solid rain and it was very wet. Occurred a couple of more times and one time actually powered down the truck. Only happens on pot holes. Speed bumps and curbs are not an issue
Wiggled the ground wire on the back of the head, went after some serious bumps and holes that day and no issues. Fine for a few days then came back. Today I pulled the ground wire from the firewall, cleaned the lead and brushed the rust of the bolt back to steel and reattached. No issue on bumps. Hit a hole – instantly back.
Checked what I believe is G103 and G104 under the driver seat (frame) and they are rusted and wiggled. No change. I tried to pull the 60 amp fuse but had alarms so it was time to contact you guys. ABS pump is not running when truck is off. Almost lilke something is loose as only on a hole and intermittant. Not sure but maybe the Caliper connect or harness is loose but it seems fine from a visual inspection.